enables identity lookup for caldav

src/backend/caldav/caldav.php

@@ -59,6 +59,9 @@ class BackendCalDAV extends BackendDiff {
      */
     public function Logon($username, $domain, $password) {
         $this->_caldav_path = str_replace('%u', $username, CALDAV_PATH);
+        if(strpos($this->_caldav_path, "%i") !== false) {
+            $this->_caldav_path = $this->LookupUserIdentifierInLdap($this->_caldav_path, $username, $domain);
+        }
         $url = sprintf("%s://%s:%d%s", CALDAV_PROTOCOL, CALDAV_SERVER, CALDAV_PORT, $this->_caldav_path);
         $this->_caldav = new CalDAVClient($url, $username, $password);
         if ($connected = $this->_caldav->CheckConnection()) {
@@ -77,6 +80,50 @@ class BackendCalDAV extends BackendDiff {
         return $connected;
     }
 
+    private function LookupUserIdentifierInLdap($caldav_path, $username, $domain) {
+        $ldap_conn = null;
+        try {
+            $ldap_conn = ldap_connect(CALDAV_IDENTITY_LDAP_SERVER, CALDAV_IDENTITY_LDAP_SERVER_PORT);
+            if ($ldap_conn) {
+                ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Connected to LDAP"));
+                ldap_set_option($ldap_conn, LDAP_OPT_PROTOCOL_VERSION, 3);
+                ldap_set_option($ldap_conn, LDAP_OPT_REFERRALS, 0);
+                $ldap_bind = ldap_bind($ldap_conn, CALDAV_IDENTITY_LDAP_USER, CALDAV_IDENTITY_LDAP_PASSWORD);
+
+                if ($ldap_bind) {
+                    ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Authenticated in LDAP"));
+                    $filter = str_replace('#username', $username, str_replace('#domain', $domain, CALDAV_IDENTITY_LDAP_QUERY));
+                    ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Searching From with filter: %s", $filter));
+                    $search = ldap_search($ldap_conn, CALDAV_IDENTITY_LDAP_BASE, $filter, array(CALDAV_IDENTITY_LDAP_IDENTIFIER));
+                    $items = ldap_get_entries($ldap_conn, $search);
+                    if ($items['count'] > 0) {
+                        $ret_value = $identity;
+                        ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Found entry in LDAP. Generating From"));
+                        // We get the first object. It's your responsability to make the query unique
+                        $caldav_path = str_replace('%i', $items[0][$field][CALDAV_IDENTITY_LDAP_IDENTIFIER], $caldav_path);
+                    }
+                    else {
+                        ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - No entry found in LDAP"));
+                    }
+                }
+                else {
+                    ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Not authenticated in LDAP server"));
+                }
+            }
+            else {
+                ZLog::Write(LOGLEVEL_DEBUG, sprintf("BackendIMAP->getIdentityFromLdap() - Not connected to LDAP server"));
+            }
+        }
+        catch(Exception $ex) {
+            ZLog::Write(LOGLEVEL_WARN, sprintf("BackendIMAP->getIdentityFromLdap() - Error getting From value from LDAP server: %s", $ex));
+        }
+
+        if ($ldap_conn != null) {
+            ldap_close($ldap_conn);
+        }
+        return $caldav_path;
+    }
+
     /**
      * The connections to CalDAV are always directly closed. So nothing special needs to happen here.
      * @see IBackend::Logoff()

src/backend/caldav/config.php

@@ -53,4 +53,19 @@ define('CALDAV_SUPPORTS_SYNC', false);
 
 // Maximum period to sync.
 // Some servers don't support more than 10 years so you will need to change this
-define('CALDAV_MAX_SYNC_PERIOD', 2147483647);
+define('CALDAV_MAX_SYNC_PERIOD', 2147483647);
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+
+// SERVER: ldap server
+// SERVER_PORT: ldap port
+// USER: dn to use for connecting
+// PASSWORD: password
+// QUERY: query to execute
+// FIELDS: columns in the query
+// FROM: string that will be the from, replacing the field names with the values
+define('CALDAV_IDENTITY_LDAP_SERVER', 'localhost');
+define('CALDAV_IDENTITY_LDAP_SERVER_PORT', '389');
+define('CALDAV_IDENTITY_LDAP_USER', 'cn=zpush,ou=servers,dc=zpush,dc=org');
+define('CALDAV_IDENTITY_LDAP_PASSWORD', 'password');
+define('CALDAV_IDENTITY_LDAP_BASE', 'dc=zpush,dc=org');
+define('CALDAV_IDENTITY_LDAP_QUERY', '(sAMAccountName=#username)');
+define('CALDAV_IDENTITY_LDAP_IDENTIFIER', "objectGUID");
\ No newline at end of file